Rotary grizzly



H. LITTLEVVOOD Jan. 5 1926.

ROTARY GRIZZLY Filed Dec. 22, 1924 2; Sheets-Sheet 1 JIS.

jan. 5 1926.

H. LITTLEVJOQD ROTARY GRI Z ZLY Sheets-Sheet 2 Filed D90. B2, 3.924

I Patented Jan. 5, 1926.

UNITED STATES PATENT OFFICE.

HERMAN LITTLEWOOI), OF NACOZARI, MEXICO," ASSIGNOR TO SMITH ENGINEERING WORKS, OF MILWAUKEE, WISCONSIN, A CORPORATION 0F WISCONSIN.

ROTARY GRIZZLY.

Application led December 22, 1924. Serial No. 757,323'.

To all whom t may concern:

Be it known that I, HERMAN LITTLE- wooD, a subject of King George IV, residing at Nacozari, Sonora, Mexico, have invented a certain new and useful Improvement in a Rotary Grizzly, of which the following is a specilication.

My invention relates to an improvement in the rotary separating devices called grizzlies, and has for one object to provide a grizzly in which the tendency of the material being separated to clog is minimized. Another object is to provide a grizzly adapted to handle material containing sticky matter, such as mud or clay. Another object is to provide a grizzly which will clear itself of the material which passes through the rings and into the interior of the drum, but for any reason cannot escape downwardly through the drum. Other objects will appear from time to time in the course 0f the specification and claims.

I illustrate my invention more or less diagrammatically in the accompanying drawings wherein- Figure l is a vertical transverse section; and

Figure 2 is a vertical longitudinal section with the drum in elevation.`

Like parts are illustrated by like symbols throughout the specification and drawings.

A, A are any suitable supporting members upon which are mounted the bearings A1, A1 secured, for example by the bolts A2.

B, B are the walls of any suitable inclosing housing. B1 is a longitudinal directing vane or chute. B3 is any suitable feed chute or spout along which the material to be separated is delivered. B4, B4 are arcuate directing vanes or ledges or chute elements concentric with the axis of rotation of the grizzly and fastened on the end walls of the casing, for example, by the bolts B5. B6 is the chute adapted to receive and deliver the material passing over the grizzly.

C is a shaft mounted on the bearings A1 and C1 is a pulley mounted thereon. Keyed to said shaft are the two drum end pieces, each comprising a rim VC3 and the spokes C4. The two end pieces C2 of the grizzly drum are keyed to the shaft with oH-set drum, the opposite ends of each cinchingl rod being out of alignment.

Threaded upon the cinching rods are a plurality of spacers D1, the spacers being deeply grooved as at D2. Each spacer has a section cut from one side as at D3 to the depth of the bottom surface of the grooves of the spacer.

Supported in position upon the drum by the grooves of the spacers and uniformly spaced therealong, are a plurality of rings E which are assembled upon the spacers when the spacers are turned with their flat or cutaway sides D3 out. The rings may then be positioned upon the spacers and are locked in position thereupon by rotation of the spacers, the liat side D3 of each spacer being then turned toward the center of the drum. While the rings are being placed, the rings, spacers and cinching rods are all held in approximate position through the should-ers or lugs D10 on one end of each cinching rod, that end being drawn up against one drum end C2 by means of the nut D12. To accommodate the lug D10, the end spacer has an aperture D14 cast in one end large enough to permit the spacer to be cinched against the drumhead and not against the lug. Rings are omitted from the grooves adjacent each end of the drum.

The inwardly projecting ledge B4 directs the ore or other material being separated inwardly toward the second ring from the end of the drum, and thereby covers the space shown in Figure 2, where no ring is positioned.

'Ihe vacant ring space, the distortion of the drum and the lagging behind of one end of the spacers permits the drum entirely to clear itself of all ore or other material passing between the rings at the top by passing it axially along toward the opening at the lagging end of the drum. In case a thin slab of the material drops between the rings but cannot be discharged therethrough, it will gradually work its way out toward the end of the grizzly that lags.

It will be realized that while I have illustrated a practical working device, nevertheless many changes might be made in the size, shape, number, relation and disposition of parts without departing from the spirit of my invention, and that I wish my description and drawings to be taken as in a broad sense descriptive and illustrative rather than as limiting me to the specific structure therein described and disclosed.

The use and operation of my invention are as follows:

I illustrate a rotary grizzly of the type customarily used in separating ores, although I do not limit it to such use. The material to be separated is fed to the grizzly, for example, by the chute B3, the grizzly drum being normally in constant rotation. The ledge B4 defleets the material so fed and delivers it to the second ring, thus preventing any over-size from passing through the large aperture left by the missing ring at the end of the drum. rlhe large particles pass over the grizzly and escape by means of the chute B6. rlhe smaller particles or fines drop through the rings of the grizzly and the major portion, however, pass through the interior space of the grizzly and through the rings again at the bottom, the space between the rings being constant and the rings being held rigidly in position by the spacers. Some particles, for example thin slabs, may pass through the rings of the grizzly at the top and fail to pass through the rings at the bottom, lying fiat on the bottom of the grizzly drinn. Such fragments and any other material as, whether by its size or by its consistency or stickiness, fails to pass through the rings will gradually move along the grizzly drum, being slowly propelled by the lagging of one drum end behind the other, and by the distortion of the connecting rods and spacers. The effect is that of a screw or spiral of very low pitch and the material will work gradually to the end of the drum and escape through the space left by the missing rino'.

In assembling the grizzly drum the cinching rods are secured to one drum end, the lugs on the rods spacing them accurately in relation thereto. They are then fastened in position by the nuts and the spacers are threaded thereon with the flattened or cut away portion facing out. The rings may then be slipped over the spacers and when the complete complement of rings is in position on the drum or on the particular spaces on which they are located, the spacer or spacers are rotated to bring the flat portion within, the rings being then positively held by the channels cast in the spacers. When the drum has been completely assembled, the opposite drum end is locked in position and the locking of the nuts at the opposite end of the cinching rods firmly secures the entire assembly together.

I claim:

l. In a rotary grizzly, a shaft and means for rotating it, a drum mounted upon said shaft, comprising a plurality of drum ends spaced therealong and rods connecting said drum ends, one of said drum ends being keyed to said shaft at a point olf-set from the point at which the other is keyed thereto, the connecting rods being thereby distorted from parallelism with the axis of the drum.

2. In a rotary grizzly, a shaft and means for rotating it, a drum mounted upon said shaft, comprising a plurality of drum ends spaced therealong and rods connecting said drum ends, one of said drum ends being keyed to said shaft at a point off-set from the point at which the other is keyed thereto, the points of connection between the con;

necting rods and one of said drum ends lag?v ging substantially behind the points of connection between the rods and the other of said drum ends, when the drum is rotated.

In a rotary grizzly, a shaft and means for rotating it, a drum, mounted about said shaft, comprising a plurality of rings spaced therealong, means for delivering material across the top of said drum and means for conveying axially along the interior of said drum from one end to the other, the material which enters between the rings and is unable to escape therethrough.

et. In a rotary grizzly, a shaft and means for rotating it, a drum, mounted about said shaft, comprising a plurality of rings spaced therealong, means for delivering material across the top of said drum and means for conveying axially along the interior of said drum the material which enters between the rings and is unable to escape therethrough, the drum being provided with a circumferential opening in its cylindrical surface, adjacent one end thereof, of greater width than the normal space between the rings, to permit the escape of such material.

In a rotary grizzly, a shaft, and means for rotating it, drum ends secured adjacent each end of said shaft, a purality of rods connecting said drum ends, a plurality of rings spaced along said rods, said drum ends being so secured to said shaft as to distort the rods from parallelism with the shaft, the points of intersection of the ends of the rods with one drum end being out of alignment with their intersection with the other, said drum being provided with a circumferential opening in its cylindrical surface adjacent one of said drum ends, larger than the normal interval between rings.

6. In a rotary grizzly, a shaft, and means for rotating it, drum ends secured adjacent each end of said shaft, a. plurality of rods connecting said drum ends, a plurality of rings spaced along said rods, said drum ends being so secured to said shaft as to distort the rods from parallelism with the shaft, the points of intersection of the ends of the rods with one drum end being out of alignment with their intersection with the other, said drum being provided with a circumferential opening in its cylindrical surface adjacent one of said drum ends, larger than the normal interval between rings, and means for feeding material to the upper side of said grizzly over the portion of the drum occupied by the normally spaced rings.

7. In a rotary grizzly, a shaft and means for rotating it, a drum mounted about said shaft, comprising a plurality of rings of substantially uniform diameter spaced therealong, and aligning rods for said rings, said aligning rods being out of parallelism with the shaft but substantially equidistant therefrom from end to end.

8. In a rotary grizzly, a shaft and means for rotating it, drum ends secured adjacent each end of said shaft, av plurality of rings uniformly spaced along said drum, the interval between the drum ends and the rings closest to each end being substantially greater than the distance between the rings, and means for guiding the material delivered to the grizzly to a point beyond the open interval between drum end and rings.

9. In a rotary grizzly, a shaft and means for rotating it, a drum mounted upon said shaft, comprising a plurality of drum ends spaced therealong and rods connecting said drum ends, one of said drum ends being keyed to said shaft at a point off-set from the point at which the other is keyed thereto, the points of connection between the connecting rods and one of said drum ends lagging substantially behind the points of connection between the rods and the other of said drum ends, when the drum is rotated, and a plurality of rings uniformly spaced along said connecting rods.

10. In a rotary grizzly, a shaft and means for rotating it, a drum mounted upon said shaft, comprising a plurality of drum ends spaced therealong and rods connecting said drum ends, one of said drum ends being keyed to said shaft at a point off-set from the point at which the other is keyed thereto, the points of connection between the connecting rods and one of said drum ends lagging substantially behind the points of connection between the rods and the other of said drum ends, when the drum is rotated, a plurality of rings uniformly spaced along said connecting rods, there being a gap in said series of rings, adjacent one end of the drum, substantially broader than the normal distance between rings, and means for guiding the material delivered to the grizzly to a point beyond said gap.

ll. In a rotary grizzly, a shaft and means for rotating it, a drum mounted upon said shaft, comprising a pair of drum ends spaced therealong, and rods connecting the drum ends, the points of connection of each rod with the respective drum ends being olfset, the rods being thereby distorted from parallelism with the axis of the drum.

12. In a rotary grizzly, a shaft and means for rotating it, a drum mounted upon said shaft, comprising a plurality of drum ends spaced therealong, and rods connecting said drum ends, the points of connection between the connecting rods and one of said drum ends lagging substantially behind the points of connection between the rods and the other of said drum ends, when the drum is rotated.

Signed at Douglas, Ariz., this 19th day of November, 1924:.

HERMAN LITTLEWOOD. 

